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original article Facilitating health behaviour change and its maintenance: Interventions based on Self-Determination Theory Despite many recent technical breakthroughs in health care, human behaviour remains the largest source of variance in health-related outcomes (Schroeder, 2007). People’s health and well-being are robustly affected by lifestyle factors such as smoking, hygiene, diet, and physical activity, all of which involve behaviours that are potentially controllable by the individual. In addition, outside of acute care settings, the effectiveness of most health care interventions is highly dependent on the patient’s adherence to self-care activities such as taking medications, performing self-examinations, or refraining from specific activities or habits. A significant problem is the poor adherence to prescribed changes or recommended behaviours over time. In the perspective of self-determination theor